GMG Introduces the 4.0 GT3/RS - No need to wait for the factory 4.0 next year.
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GMG Introduces the 4.0 GT3/RS - No need to wait for the factory 4.0 next year.
GMG Introduces the 4.0 GT3/RS kit -
We are proud to introduce our GMG 4.0 Liter power kit for the GT3/RS 3.8 and 3.6 liter engines.
The kit consists of the crown jewel our very own "true"
4.0 liter billet crank shaft
Forged con rods
pistons and cylinders made by Mahle with our own piston design.
This is not a slap in piston and cylinder kit like most tuners on the market are selling to get you close to the displacement.
We properly designed and engineered a true stroker engine much like the factory has with the new released 4.0 liter GT3RS yet we were able to improve upon what a production car would use in terms of the hardware
The crank shaft itself is made by a F1 supplier in europe and utilizes the latest technology in crankshaft design this is our very own design.
In the pictures you will notice the finish of the material notice the smooth surface of the counter weights when compared to the 3.6 crank and even when compared to the 3.8 GT3RSR Motorsport crank.
Some of the key features of the crank shaft include:
Billet is stronger than a forged crank shaft
Lighter weight - less rotational mass offers improved engine response.
Can be used and tested for both high rev'ing naturally aspirated engines which can see over 10,000 rpm or high boost turbo applications making in excess of 950 "real" bhp.
New main bearing oiling design for high load and high rpm use.
Notice the oil galley on the crank shaft journal versus a squirter on stock style crank.
Each crank shaft is meticulously micro polished - balanced and blue printed and matched to the con rods as well as the pistons and flywheel/clutch assembly.
Here are a few pictures of the new crank as it compares to the the GT3RSR and standard crank shaft.
GMG's 4.0 Liter Crank shaft and Rod kit
Notice main bearing journals now have additional oiling for the main bearing.
From top to bottom
GMG 4.0 liter crank
Porsche Motorsport 3.8RSR crank
3.6 crank
GMG 4.0 Liter crank counter weight finish.
3.8RSR motorsport crank finish
Comparing the two
Oiling of the factory 3.6 crank- notice how rough the finish of the crank is.
Oiling of the factory Motorsport 3.8 RSR crank- much improved over a stock crank. Finish does have some improvements and weight savings
Our update saves weight and moves the oiling directly to the main bearing with no need to worry about the lack of oiling under extreme use.
For those of you with the GT3's either 3.6 or 3.8 liter engines we also offer some of our other work such as high lift cams- with proper vario cam control, these are NEW billets not regrinds like everyone else is doing.
We also have a proper high lift cam for turbo cars with vario cam control unlike everyone else who is trying to use a cup car cam to work in turbo engines.
In addition we also offer CNC cylinder head porting and custom sealing ring machine work for high boost applications.
We feel that the solutions we have developed through our experience gained over the years in professional racing have given us the advantage in the market place to develop and provide you the best possible upgrades for your vehicles without any compromise or sacrifice in performance or reliability.
We have a ala cart menu for engines builds whether they are normally aspirated or turbocharged for road or racing use.
Since there are so many different options from a simple bottom end build to a complete engine please email us for a quote.
All street based engines are broken in on an engine dyno with performance verified than installed in your car and run on our chassis dyno to verify the performance of the engine. No more guessing games of what someone claims the car makes.
With our partners GIAC we can custom tune the engine for road car use or we can do a custom stand alone system such as a Motec, Link, Pectel, Magneti Marelli or other system for race car applications.
We are also happy to work with a tuner of your choice should you decide.
We can arrange for shipment and delivery of your engine or car worldwide.
Please email me directly for quotes or questions.
We are proud to introduce our GMG 4.0 Liter power kit for the GT3/RS 3.8 and 3.6 liter engines.
The kit consists of the crown jewel our very own "true"
4.0 liter billet crank shaft
Forged con rods
pistons and cylinders made by Mahle with our own piston design.
This is not a slap in piston and cylinder kit like most tuners on the market are selling to get you close to the displacement.
We properly designed and engineered a true stroker engine much like the factory has with the new released 4.0 liter GT3RS yet we were able to improve upon what a production car would use in terms of the hardware
The crank shaft itself is made by a F1 supplier in europe and utilizes the latest technology in crankshaft design this is our very own design.
In the pictures you will notice the finish of the material notice the smooth surface of the counter weights when compared to the 3.6 crank and even when compared to the 3.8 GT3RSR Motorsport crank.
Some of the key features of the crank shaft include:
Billet is stronger than a forged crank shaft
Lighter weight - less rotational mass offers improved engine response.
Can be used and tested for both high rev'ing naturally aspirated engines which can see over 10,000 rpm or high boost turbo applications making in excess of 950 "real" bhp.
New main bearing oiling design for high load and high rpm use.
Notice the oil galley on the crank shaft journal versus a squirter on stock style crank.
Each crank shaft is meticulously micro polished - balanced and blue printed and matched to the con rods as well as the pistons and flywheel/clutch assembly.
Here are a few pictures of the new crank as it compares to the the GT3RSR and standard crank shaft.
GMG's 4.0 Liter Crank shaft and Rod kit
Notice main bearing journals now have additional oiling for the main bearing.
From top to bottom
GMG 4.0 liter crank
Porsche Motorsport 3.8RSR crank
3.6 crank
GMG 4.0 Liter crank counter weight finish.
3.8RSR motorsport crank finish
Comparing the two
Oiling of the factory 3.6 crank- notice how rough the finish of the crank is.
Oiling of the factory Motorsport 3.8 RSR crank- much improved over a stock crank. Finish does have some improvements and weight savings
Our update saves weight and moves the oiling directly to the main bearing with no need to worry about the lack of oiling under extreme use.
For those of you with the GT3's either 3.6 or 3.8 liter engines we also offer some of our other work such as high lift cams- with proper vario cam control, these are NEW billets not regrinds like everyone else is doing.
We also have a proper high lift cam for turbo cars with vario cam control unlike everyone else who is trying to use a cup car cam to work in turbo engines.
In addition we also offer CNC cylinder head porting and custom sealing ring machine work for high boost applications.
We feel that the solutions we have developed through our experience gained over the years in professional racing have given us the advantage in the market place to develop and provide you the best possible upgrades for your vehicles without any compromise or sacrifice in performance or reliability.
We have a ala cart menu for engines builds whether they are normally aspirated or turbocharged for road or racing use.
Since there are so many different options from a simple bottom end build to a complete engine please email us for a quote.
All street based engines are broken in on an engine dyno with performance verified than installed in your car and run on our chassis dyno to verify the performance of the engine. No more guessing games of what someone claims the car makes.
With our partners GIAC we can custom tune the engine for road car use or we can do a custom stand alone system such as a Motec, Link, Pectel, Magneti Marelli or other system for race car applications.
We are also happy to work with a tuner of your choice should you decide.
We can arrange for shipment and delivery of your engine or car worldwide.
Please email me directly for quotes or questions.
Last edited by Fabryce@GMGRacing; May 16, 2011 at 07:33 PM.
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That crank looks so beautiful that I can put it for display in my house rather than the engine 
So smooth and sexy...
The main difference between the road version and race version is the software? Are there other internal parts that is different as well?
So smooth and sexy...The main difference between the road version and race version is the software? Are there other internal parts that is different as well?
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Thread Starter
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Former Vendor
Joined: Jul 2004
Posts: 4,764
From: Orange County SoCal
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Gentlemen
Per the post.
BHP numbers will vary depending on the engine configuration ( cams head work etc) and compression ratio you choose.
BHP # will vary from 500+( Entry level) to 540 depending on the package you go with. ( Street car)
These are real BHP numbers - not over inflated internet racing numbers.
The rods are forged and not titanium.
There is NO need to bore the block we replace the piston and cylinder complete.
Some tuners are doing just that ( slap in P& C and achieve displacement with bore only) but this is a proper 4.0 stroker engine with the correct piston and cylinder sizes.
Race versions engines can be spec'd out with higher compression, higher lift cams etc.
Street engines are available with a warranty.
Since this is a custom program meaning we have several engine options and variations you can spec out it is best to call or email for a quote.
This program translates to all dry sump engines from 2000+ 996 GT3 , Turbo , GT2, GT3RS in 3.4, 3.6 and 3.8 liter configurations.
Per the post.
BHP numbers will vary depending on the engine configuration ( cams head work etc) and compression ratio you choose.
BHP # will vary from 500+( Entry level) to 540 depending on the package you go with. ( Street car)
These are real BHP numbers - not over inflated internet racing numbers.
The rods are forged and not titanium.
There is NO need to bore the block we replace the piston and cylinder complete.
Some tuners are doing just that ( slap in P& C and achieve displacement with bore only) but this is a proper 4.0 stroker engine with the correct piston and cylinder sizes.
Race versions engines can be spec'd out with higher compression, higher lift cams etc.
Street engines are available with a warranty.
Since this is a custom program meaning we have several engine options and variations you can spec out it is best to call or email for a quote.
This program translates to all dry sump engines from 2000+ 996 GT3 , Turbo , GT2, GT3RS in 3.4, 3.6 and 3.8 liter configurations.
Last edited by Fabryce@GMGRacing; May 17, 2011 at 10:32 AM.
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Former Vendor
Joined: Jul 2004
Posts: 4,764
From: Orange County SoCal
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Here are some pictures of the head work we do.
CNC port on the head- We are one of the few companies that digitize the head port and and in the CNC program maximize the CFM the head flows. Each head port is identical, this is something that the factory does not even offer.
With the level of engines we are building this is the type of work we do.
Notice the head sealing ring system - Turbo head shown.
CNC port on the head- We are one of the few companies that digitize the head port and and in the CNC program maximize the CFM the head flows. Each head port is identical, this is something that the factory does not even offer.
With the level of engines we are building this is the type of work we do.
Notice the head sealing ring system - Turbo head shown.